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Aviation History
1940
1940 - 0935.PDF
MARCH 28, 1940 10 THE AIRCRAFT ENGINEER SUPPLEMENT TOFLIGHT WEB TYPE IMPELLER WITH a»fclmmn- 2Q2OO min-r 1 DIFFUSER VANE POSITION *- 2 <• « TO DtFFUSER VANES 2 1-3 1-4 1-5 -9.0O0- Influence of diffuser vane angle on high-efficiency web type supercharger. the bottom drawing, while the curves o (marked with little squares) show the results on the same diffuser without vanes. Medium vane angles are obviously best, the very detrimental effect of the very small angle 1 being particu- larly noticeable. Though in this case the vaneless arrange- ment shows a loss of both pressure and efficiency over the better vane angles, the extraordinary flatness of the pres- sure and efficiency curves are very noteworthy. The effects of separate improvements in the inlet leads, impeller, diffuses vanes and spiral volute are to a large extent cumulative. The total effect of all these refinements is shown by Fig. 11, which gives the test curves of the experimental supercharger developed by the DVL, with closed impeller, inlet fan and the best diffuser vane and spiral arrangement. These curves show, beside the adiaba- uc pressure head HAD the pressure ratio p2/p,. The curves about right angles to the pressure curves show the flow mGC. 3-4 '1-8 2-O Complete test curves of experimental DVL supercharger with closed-type impeller. Transverse supercharger on Daimler-Benz type 600 engine. The throttle is on the pressure side.
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